Unix security and privacy setting unix command via apple remote desktop

Question

Could someone guide me on the unix command to set System Preferemces Security & Privacy to xx minutes [see screenshot please] via Apple Remote Desktop.
https://dl.dropbox.com/u/5485939/osx_screenshots/sys%20pref%20security%20privacy .png
Thank you,

Answer 1

Pereference tend to be stored for the computer as a whole
/Library/Preferences/
or specifcally for the user
/Users/USERNAME/Library/Preferences/
well when I set required password for XX minutes... I see that
/Users/USERNAME/Library/Preferences/com.apple.screensaver.plist modfication date & time changes to the current time & date... hMMM maybe the setting we want is stored here? Can we test this?
If I check require password and then do the terminal command:
defaults read ~/Library/Preferences/com.apple.screensaver
I see
    askForPassword = 1;
    askForPasswordDelay = 0;
    tokenRemovalAction = 0;
turn it off
run the terminal command;
defaults read ~/Library/Preferences/com.apple.screensaver
I see:
    askForPassword = 0;
    askForPasswordDelay = 0;
    tokenRemovalAction = 0;
so I can turn it on with
defaults write ~/Library/Preferences/com.apple.screensaver askForPassword -bool TRUE
and I can turn it off with
defaults write ~/Library/Preferences/com.apple.screensaver askForPassword -bool FALSE
So if a user is logged into a computer. I could send unix command as current console user.
defaults write ~/Library/Preferences/com.apple.screensaver askForPassword -bool TRUE
BUT what if the user is logged out? or there are more then one user on the computer?
then I could run unix command as user root and send
defaults write /Users/USERNAME/Library/Preferences/com.apple.screensaver askForPassword -bool TRUE
(replace USERNAME with the user's short name.)
but what if I don't know the user name? or names
send unix command as root
ls -al /Users/
get back a list of folders
bob
surely
shares
and then do
send unix command as root
defaults write /Users/bob/Library/Preferences/com.apple.screensaver askForPassword -bool TRUE
defaults write /Users/surely/Library/Preferences/com.apple.screensaver askForPassword -bool TRUE
you could also do some thing like
defaults write ~/Library/Preferences/com.apple.screensaver askForPasswordDelay -integer 5
if you want to change the period of time to lock to 5 seconds
or
defaults write ~/Library/Preferences/com.apple.screensaver askForPasswordDelay -integer 900
(900 seconds  / 60 seconds = 15 minutes)